国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

Make me your Homepage
left corner left corner
China Daily Website

Spacecraft launch to set new records

Updated: 2012-06-14 08:09
By Xin Dingding in Jiuquan, Gansu (China Daily)

The impending launch of the manned Shenzhou IX spacecraft will be the first time that China's astronauts will stay in space for more than 10 days, said Cui Jijun, chief commander of the country's first space docking mission's launch site system, on Wednesday.

The previous record is five days, set by the Shenzhou VI spacecraft in 2005.

The mission will also complete the country's first manned space docking to master the necessary technology for assembling a space station, see China's first female astronaut in space and have astronauts entering a space lab module for the first time, he added.

It is also the first time for the Jiuquan Satellite Launch Center, located in a desert, to conduct a mission in the summer.

The past nine launches of China's manned space program were held in the spring, autumn and winter, but not summer. The three manned spacecraft all blasted off in autumn.

The Shenzhou V spacecraft carrying China's first astronaut Yang Liwei lifted off on Oct 15, 2003, followed by Shenzhou VI with two astronauts on Oct 12, 2005, and Shenzhou VII with three astronauts on Sept 25, 2008.

"The high temperature of the summer poses a challenge for us to guarantee the stability of propellant, especially if the launch is to be delayed," Cui said.

On Tuesday, a local meteorological observation said the temperature at the launch center reached 36 C. The temperature in places without shade was even higher.

In order to guarantee the mission's success, the launch center has updated its facilities. Experts also drafted plans on how to best store the propellant on hot days and how to unload the propellant safely in emergencies, Cui said.

Launching the spacecraft in the summer isn't a bad idea, as Jiuquan has strong winds in the spring and is too cold in the winter, he said.

"There is a saying describing the windy spring here - Winds come only twice a year, but each time it goes on for half a year," he said.

In the winter, the temperature in Jiuquan sometimes drops below -20 C, while the requirement for space launches is between -20 C and 40 C, he said.

Though some worry that a thunderstorm could hamper space launches in the summer, Cui said that the Jiuquan launch center has far fewer thunderstorms than other launch centers in China, and that stormy weather isn't a concern.

So far, the manned space program has yet to officially announce the launch window, but the preset date for launch in mid-June is forecast to have good weather, according to Zhang Daochang, deputy chief commander of the mission's launch site system.

Zhang cited the weather forecast as saying that the strong wind blowing sand in the air will subside by Thursday. The weather between Thursday and Saturday will be good, with "only a weak cold air front".

xindingding@chinadaily.com.cn

(China Daily 06/14/2012 page3)

 
...
Hot Topics
...
...
高雄市| 兴海县| 调兵山市| 乐平市| 乌拉特中旗| 简阳市| 莱阳市| 锦州市| 荔波县| 进贤县| 乐都县| 漳平市| 日土县| 章丘市| 柞水县| 仙游县| 施甸县| 逊克县| 潮安县| 榆社县| 焦作市| 易门县| 安国市| 贵溪市| 喜德县| 康保县| 桐乡市| 陆河县| 隆德县| 西丰县| 峡江县| 大邑县| 萨迦县| 报价| 奉贤区| 娄底市| 嵩明县| 宁河县| 黑山县| 惠安县| 进贤县|